Improvement in screw and pivot chairs



w. T. npnfmus. Screw and Pivot Ghairs.

Patented June 1 6, 1874.

NOA-52,08?.

INVENTUB WITNESSES.

- ATTonNEYs,

UNITED STATES VILLIAM T. DOREMS, OF NEV YORK, N. Y.

IMPROVEMENT IN SCREW AND PIVOT CHAIRS.

Specification. forming part of Letters Patent No. 152,087, dated June 16, 1&71; application filed March 7, 1874.

To all whom it may concern:

Be it known that I, VILLIAM T. DOREMUS, of N ew York city, in the county and State of New York, have invented a new and useful Improvement in Screw and Pivot Chairs, of which the following is a specification:

Figure 1 is a detailed sectional view of a portion of a screw-chair illustrating my invention. Fig. 2 is a horizontal section of the same taken through the line a: Fig. 1.

Similar letters of reference indicate corre spending parts.

The invention will irst be fully described, and then pointed out in the claim.

A represents the chair-seat, which rests upon the rubber springs B. C is a cross-bar, upon the ends of which are formed seats for the rubber springs B, and which is secured to the seat A by bolts D, which also pass through the rubber springs B. In the center of the cross-bar C is formed a long socket, c, in the inner surface of which is formed a screw- -thread, into which ts the thread of the screw E. The lower end of the screw E enters a hole in the center of the plate F, and is secured in place by a pin, which passes through it, and through a colla-r formed solidly upon the lower side of the said plate.v F, and which lit-s into ahole in the center of the base or pedestal Gr. The lower end of the screw E has a iiner screw-thread formed upon it, which ts into the screw-thread formed in the plate H placed upon the lower side of the base Gr, and which has a collar formed upon its lower side to give a longer bearing to the screw, and which is made polygonal in form, so that a wrench may be readily applied to it for screwing the plate H on and on". By this construction screw E will be 'securely connected with the base, so that it will be firmly held, and will wholly remove the ldifficulty heretofore experienced, in securing the screw or pivot socket to said base. This construction also enables the pedestal or base to be made low to better adapt the cha-ir for being upholstered; and also enables it to be made lighter than is possible when the screw or pvot socket is attached to said base.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combination ot chair-screw E, having independent end thread, the top plate F bolted thereto, the base G, and nut-plate H, all coni structed and applied together, as and for the purpose speciiied.

WILLIAM T. DOREMUS. Titnessesz v J AMEs T. DoREMUs, T. B. MosHER. 

